Operating instructions

48 1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009
Polling
Poll timer unit is multiplied by the Poll timer time to allow times from 100ms to 182 hours
(over a week).
In Mode I, leaving this at zero enables Spontaneous Mode, which is not polled. Entering a
time makes the Base poll with that frequency, and the Outstation expect a poll and raise an
alarm if it is not received with that frequency.
In Mode E, this parameter is ignored at the Base, because polling and acknowledgements
are controlled by external equipment. At the Outstation, any value other than zero makes the
Outstation expect a poll and raise an alarm if it is not received with that frequency.
For more detailed information, see pages 20 and 10 to 12.
General Alarm Parameters
Alarm message retries If acknowledgement is not received when expected after a
transmission, repeat attempts are made until an acknowledgement is received or a total of
this number of transmissions have been made. Equivalent to ATS185.
No of packets missed before Comms alarm If acknowledgement is not received by the
Base after this number of polls or spontaneous/alarm transmissions to the Outstation, a
Comms Alarm is raised. If an Outstation does not hear a poll for this number of poll periods
(plus 3s for each period), or receives no acknowledgement to this number of spontaneous or
alarm transmissions, a Comms Alarm is raised. The Poll Timer (ATS183) sets the poll
period. Equivalent to ATS184.
In order to to disable all transmissions initiated by the unit, not including replies to polls etc.
which continue as usual, remove the tick in the box by Alarm master switch so that its legend
reads “Disabled”. To enable transmissions initiated by the unit, click the box again to restore
the tick, when the legend changes to “Enabled”. Equivalent to ATS330.
If a housekeeping (comms or power) alarm is raised, the unit can apply failsafe levels to its
telemetry outputs. This can be prevented by clicking on Failsafe master switch to remove
the tick in the box so that its legend reads “Disabled”. Click the box again to restore the tick,
when the legend changes to “Enabled”. Equivalent to ATS188.